(function( jQuery, undefined ){

  /*
   * a port of the...
   * jQuery Templating Plugin
   * Copyright 2010, John Resig
   * Dual licensed under the MIT or GPL Version 2 licenses.
   */

  var oldManip = jQuery.fn.domManip, tmplItmAtt = "_tmplitem", htmlExpr = /^[^<]*(<[\w\W]+>)[^>]*$|\{\{\! /,
    newTmplItems = {}, wrappedItems = {}, appendToTmplItems, topTmplItem = { key: 0, data: {} }, itemKey = 0, cloneIndex = 0, stack = [];

  function newTmplItem( options, parentItem, fn, data ) {
    // Returns a template item data structure for a new rendered instance of a template (a 'template item').
    // The content field is a hierarchical array of strings and nested items (to be
    // removed and replaced by nodes field of dom elements, once inserted in DOM).
    var newItem = {
      data: data || (parentItem ? parentItem.data : {}),
      _wrap: parentItem ? parentItem._wrap : null,
      tmpl: null,
      parent: parentItem || null,
      nodes: [],
      calls: tiCalls,
      nest: tiNest,
      wrap: tiWrap,
      html: tiHtml,
      update: tiUpdate
    };
    if ( options ) {
      jQuery.extend( newItem, options, { nodes: [], parent: parentItem } );
    }
    if ( fn ) {
      // Build the hierarchical content to be used during insertion into DOM
      newItem.tmpl = fn;
      newItem._ctnt = newItem._ctnt || newItem.tmpl( jQuery, newItem );
      newItem.key = ++itemKey;
      // Keep track of new template item, until it is stored as jQuery Data on DOM element
      (stack.length ? wrappedItems : newTmplItems)[itemKey] = newItem;
    }
    return newItem;
  }

  // Override appendTo etc., in order to provide support for targeting multiple elements. (This code would disappear if integrated in jquery core).
  jQuery.each({
    appendTo: "append",
    prependTo: "prepend",
    insertBefore: "before",
    insertAfter: "after",
    replaceAll: "replaceWith"
  }, function( name, original ) {
    jQuery.fn[ name ] = function( selector ) {
      var ret = [], insert = jQuery( selector ), elems, i, l, tmplItems,
        parent = this.length === 1 && this[0].parentNode;

      appendToTmplItems = newTmplItems || {};
      if ( parent && parent.nodeType === 11 && parent.childNodes.length === 1 && insert.length === 1 ) {
        insert[ original ]( this[0] );
        ret = this;
      } else {
        for ( i = 0, l = insert.length; i < l; i++ ) {
          cloneIndex = i;
          elems = (i > 0 ? this.clone(true) : this).get();
          jQuery.fn[ original ].apply( jQuery(insert[i]), elems );
          ret = ret.concat( elems );
        }
        cloneIndex = 0;
        ret = this.pushStack( ret, name, insert.selector );
      }
      tmplItems = appendToTmplItems;
      appendToTmplItems = null;
      jQuery.tmpl.complete( tmplItems );
      return ret;
    };
  });

  jQuery.fn.extend({
    // Use first wrapped element as template markup.
    // Return wrapped set of template items, obtained by rendering template against data.
    tmpl: function( data, options, parentItem ) {
      return jQuery.tmpl( this[0], data, options, parentItem );
    },

    // Find which rendered template item the first wrapped DOM element belongs to
    tmplItem: function() {
      return jQuery.tmplItem( this[0] );
    },

    // Consider the first wrapped element as a template declaration, and get the compiled template or store it as a named template.
    template: function( name ) {
      return jQuery.template( name, this[0] );
    },

    domManip: function( args, table, callback, options ) {
      // This appears to be a bug in the appendTo, etc. implementation
      // it should be doing .call() instead of .apply(). See #6227
      if ( args[0] && args[0].nodeType ) {
        var dmArgs = jQuery.makeArray( arguments ), argsLength = args.length, i = 0, tmplItem;
        while ( i < argsLength && !(tmplItem = jQuery.data( args[i++], "tmplItem" ))) {}
        if ( argsLength > 1 ) {
          dmArgs[0] = [jQuery.makeArray( args )];
        }
        if ( tmplItem && cloneIndex ) {
          dmArgs[2] = function( fragClone ) {
            // Handler called by oldManip when rendered template has been inserted into DOM.
            jQuery.tmpl.afterManip( this, fragClone, callback );
          };
        }
        oldManip.apply( this, dmArgs );
      } else {
        oldManip.apply( this, arguments );
      }
      cloneIndex = 0;
      if ( !appendToTmplItems ) {
        jQuery.tmpl.complete( newTmplItems );
      }
      return this;
    }
  });

  jQuery.extend({
    // Return wrapped set of template items, obtained by rendering template against data.
    tmpl: function( tmpl, data, options, parentItem ) {
      var ret, topLevel = !parentItem;
      if ( topLevel ) {
        // This is a top-level tmpl call (not from a nested template using {{tmpl}})
        parentItem = topTmplItem;
        tmpl = jQuery.template[tmpl] || jQuery.template( null, tmpl );
        wrappedItems = {}; // Any wrapped items will be rebuilt, since this is top level
      } else if ( !tmpl ) {
        // The template item is already associated with DOM - this is a refresh.
        // Re-evaluate rendered template for the parentItem
        tmpl = parentItem.tmpl;
        newTmplItems[parentItem.key] = parentItem;
        parentItem.nodes = [];
        if ( parentItem.wrapped ) {
          updateWrapped( parentItem, parentItem.wrapped );
        }
        // Rebuild, without creating a new template item
        return jQuery( build( parentItem, null, parentItem.tmpl( jQuery, parentItem ) ));
      }
      if ( !tmpl ) {
        return []; // Could throw...
      }
      if ( typeof data === "function" ) {
        data = data.call( parentItem || {} );
      }
      if ( options && options.wrapped ) {
        updateWrapped( options, options.wrapped );
      }
      ret = jQuery.isArray( data ) ?
        jQuery.map( data, function( dataItem ) {
          return dataItem ? newTmplItem( options, parentItem, tmpl, dataItem ) : null;
        }) :
        [ newTmplItem( options, parentItem, tmpl, data ) ];
      return topLevel ? jQuery( build( parentItem, null, ret ) ) : ret;
    },

    // Return rendered template item for an element.
    tmplItem: function( elem ) {
      var tmplItem;
      if ( elem instanceof jQuery ) {
        elem = elem[0];
      }
      while ( elem && elem.nodeType === 1 && !(tmplItem = jQuery.data( elem, "tmplItem" )) && (elem = elem.parentNode) ) {}
      return tmplItem || topTmplItem;
    },

    // Set:
    // Use $.template( name, tmpl ) to cache a named template,
    // where tmpl is a template string, a script element or a jQuery instance wrapping a script element, etc.
    // Use $( "selector" ).template( name ) to provide access by name to a script block template declaration.

    // Get:
    // Use $.template( name ) to access a cached template.
    // Also $( selectorToScriptBlock ).template(), or $.template( null, templateString )
    // will return the compiled template, without adding a name reference.
    // If templateString includes at least one HTML tag, $.template( templateString ) is equivalent
    // to $.template( null, templateString )
    template: function( name, tmpl ) {
      if (tmpl) {
        // Compile template and associate with name
        if ( typeof tmpl === "string" ) {
          // This is an HTML string being passed directly in.
          tmpl = buildTmplFn( tmpl )
        } else if ( tmpl instanceof jQuery ) {
          tmpl = tmpl[0] || {};
        }
        if ( tmpl.nodeType ) {
          // If this is a template block, use cached copy, or generate tmpl function and cache.
          tmpl = jQuery.data( tmpl, "tmpl" ) || jQuery.data( tmpl, "tmpl", buildTmplFn( tmpl.innerHTML ));
        }
        return typeof name === "string" ? (jQuery.template[name] = tmpl) : tmpl;
      }
      // Return named compiled template
      return name ? (typeof name !== "string" ? jQuery.template( null, name ):
        (jQuery.template[name] ||
          // If not in map, treat as a selector. (If integrated with core, use quickExpr.exec)
          jQuery.template( null, htmlExpr.test( name ) ? name : jQuery( name )))) : null;
    },

    encode: function( text ) {
      // Do HTML encoding replacing < > & and ' and " by corresponding entities.
      return ("" + text).split("<").join("&lt;").split(">").join("&gt;").split('"').join("&#34;").split("'").join("&#39;");
    }
  });

  jQuery.extend( jQuery.tmpl, {
    tag: {
      "tmpl": {
        _default: { $2: "null" },
        open: "if($notnull_1){___$$$___=___$$$___.concat($item.nest($1,$2));}"
        // tmpl target parameter can be of type function, so use $1, not $1a (so not auto detection of functions)
        // This means that {{tmpl foo}} treats foo as a template (which IS a function).
        // Explicit parens can be used if foo is a function that returns a template: {{tmpl foo()}}.
      },
      "wrap": {
        _default: { $2: "null" },
        open: "$item.calls(_,$1,$2);_=[];",
        close: "call=$item.calls();___$$$___=call.___$$$___.concat($item.wrap(call,___$$$___));"
      },
      "each": {
        _default: { $2: "$index, $value" },
        open: "if($notnull_1){$.each($1a,function($2){with(this){",
        close: "}});}"
      },
      "if": {
        open: "if(($notnull_1) && $1a){",
        close: "}"
      },
      "else": {
        _default: { $1: "true" },
        open: "}else if(($notnull_1) && $1a){"
      },
      "html": {
        // Unecoded expression evaluation.
        open: "if($notnull_1){___$$$___.push($1a);}"
      },
      "=": {
        // Encoded expression evaluation. Abbreviated form is ${}.
        _default: { $1: "$data" },
        open: "if($notnull_1){___$$$___.push($.encode($1a));}"
      },
      "!": {
        // Comment tag. Skipped by parser
        open: ""
      }
    },

    // This stub can be overridden, e.g. in jquery.tmplPlus for providing rendered events
    complete: function( items ) {
      newTmplItems = {};
    },

    // Call this from code which overrides domManip, or equivalent
    // Manage cloning/storing template items etc.
    afterManip: function afterManip( elem, fragClone, callback ) {
      // Provides cloned fragment ready for fixup prior to and after insertion into DOM
      var content = fragClone.nodeType === 11 ?
        jQuery.makeArray(fragClone.childNodes) :
        fragClone.nodeType === 1 ? [fragClone] : [];

      // Return fragment to original caller (e.g. append) for DOM insertion
      callback.call( elem, fragClone );

      // Fragment has been inserted:- Add inserted nodes to tmplItem data structure. Replace inserted element annotations by jQuery.data.
      storeTmplItems( content );
      cloneIndex++;
    }
  });

  //========================== Private helper functions, used by code above ==========================

  function build( tmplItem, nested, content ) {
    // Convert hierarchical content into flat string array
    // and finally return array of fragments ready for DOM insertion
    var frag, ret = content ? jQuery.map( content, function( item ) {
      return (typeof item === "string") ?
        // Insert template item annotations, to be converted to jQuery.data( "tmplItem" ) when elems are inserted into DOM.
        (tmplItem.key ? item.replace( /(<\w+)(?=[\s>])(?![^>]*_tmplitem)([^>]*)/g, "$1 " + tmplItmAtt + "=\"" + tmplItem.key + "\" $2" ) : item) :
        // This is a child template item. Build nested template.
        build( item, tmplItem, item._ctnt );
    }) :
    // If content is not defined, insert tmplItem directly. Not a template item. May be a string, or a string array, e.g. from {{html $item.html()}}.
    tmplItem;
    if ( nested ) {
      return ret;
    }

    // top-level template
    ret = ret.join("");

    // Support templates which have initial or final text nodes, or consist only of text
    // Also support HTML entities within the HTML markup.
    ret.replace( /^\s*([^<\s][^<]*)?(<[\w\W]+>)([^>]*[^>\s])?\s*$/, function( all, before, middle, after) {
      frag = jQuery( middle ).get();

      storeTmplItems( frag );
      if ( before ) {
        frag = unencode( before ).concat(frag);
      }
      if ( after ) {
        frag = frag.concat(unencode( after ));
      }
    });
    return frag ? frag : unencode( ret );
  }

  function unencode( text ) {
    // Use createElement, since createTextNode will not render HTML entities correctly
    var el = document.createElement( "div" );
    el.innerHTML = text;
    return jQuery.makeArray(el.childNodes);
  }

  // Generate a reusable function that will serve to render a template against data
  function buildTmplFn( markup ) {
    return new Function("jQuery","$item",
      "var $=jQuery,call,___$$$___=[],$data=$item.data;" +

      // Introduce the data as local variables using with(){}
      "with($data){___$$$___.push('" +

      // Convert the template into pure JavaScript
      jQuery.trim(markup)
        .replace( /([\\'])/g, "\\$1" )
        .replace( /[\r\t\n]/g, " " )
        .replace( /\$\{([^\}]*)\}/g, "{{= $1}}" )
        .replace( /\{\{(\/?)(\w+|.)(?:\(((?:[^\}]|\}(?!\}))*?)?\))?(?:\s+(.*?)?)?(\(((?:[^\}]|\}(?!\}))*?)\))?\s*\}\}/g,
        function( all, slash, type, fnargs, target, parens, args ) {
          var tag = jQuery.tmpl.tag[ type ], def, expr, exprAutoFnDetect;
          if ( !tag ) {
            throw "Template command not found: " + type;
          }
          def = tag._default || [];
          if ( parens && !/\w$/.test(target)) {
            target += parens;
            parens = "";
          }
          if ( target ) {
            target = unescape( target );
            args = args ? ("," + unescape( args ) + ")") : (parens ? ")" : "");
            // Support for target being things like a.toLowerCase();
            // In that case don't call with template item as 'this' pointer. Just evaluate...
            expr = parens ? (target.indexOf(".") > -1 ? target + parens : ("(" + target + ").call($item" + args)) : target;
            exprAutoFnDetect = parens ? expr : "(typeof(" + target + ")==='function'?(" + target + ").call($item):(" + target + "))";
          } else {
            exprAutoFnDetect = expr = def.$1 || "null";
          }
          fnargs = unescape( fnargs );
          return "');" +
            tag[ slash ? "close" : "open" ]
              .split( "$notnull_1" ).join( target ? "typeof(" + target + ")!=='undefined' && (" + target + ")!=null" : "true" )
              .split( "$1a" ).join( exprAutoFnDetect )
              .split( "$1" ).join( expr )
              .split( "$2" ).join( fnargs ?
                fnargs.replace( /\s*([^\(]+)\s*(\((.*?)\))?/g, function( all, name, parens, params ) {
                  params = params ? ("," + params + ")") : (parens ? ")" : "");
                  return params ? ("(" + name + ").call($item" + params) : all;
                })
                : (def.$2||"")
              ) +
            "___$$$___.push('";
        }) +
      "');}return ___$$$___;"
    );
  }
  function updateWrapped( options, wrapped ) {
    // Build the wrapped content.
    options._wrap = build( options, true,
      // Suport imperative scenario in which options.wrapped can be set to a selector or an HTML string.
      jQuery.isArray( wrapped ) ? wrapped : [htmlExpr.test( wrapped ) ? wrapped : jQuery( wrapped ).html()]
    ).join("");
  }

  function unescape( args ) {
    return args ? args.replace( /\\'/g, "'").replace(/\\\\/g, "\\" ) : null;
  }
  function outerHtml( elem ) {
    var div = document.createElement("div");
    div.appendChild( elem.cloneNode(true) );
    return div.innerHTML;
  }

  // Store template items in jQuery.data(), ensuring a unique tmplItem data data structure for each rendered template instance.
  function storeTmplItems( content ) {
    var keySuffix = "_" + cloneIndex, elem, elems, newClonedItems = {}, i, l, m;
    for ( i = 0, l = content.length; i < l; i++ ) {
      if ( (elem = content[i]).nodeType !== 1 ) {
        continue;
      }
      elems = elem.getElementsByTagName("*");
      for ( m = elems.length - 1; m >= 0; m-- ) {
        processItemKey( elems[m] );
      }
      processItemKey( elem );
    }
    function processItemKey( el ) {
      var pntKey, pntNode = el, pntItem, tmplItem, key;
      // Ensure that each rendered template inserted into the DOM has its own template item,
      if ( (key = el.getAttribute( tmplItmAtt ))) {
        while ( pntNode.parentNode && (pntNode = pntNode.parentNode).nodeType === 1 && !(pntKey = pntNode.getAttribute( tmplItmAtt ))) { }
        if ( pntKey !== key ) {
          // The next ancestor with a _tmplitem expando is on a different key than this one.
          // So this is a top-level element within this template item
          // Set pntNode to the key of the parentNode, or to 0 if pntNode.parentNode is null, or pntNode is a fragment.
          pntNode = pntNode.parentNode ? (pntNode.nodeType === 11 ? 0 : (pntNode.getAttribute( tmplItmAtt ) || 0)) : 0;
          if ( !(tmplItem = newTmplItems[key]) ) {
            // The item is for wrapped content, and was copied from the temporary parent wrappedItem.
            tmplItem = wrappedItems[key];
            tmplItem = newTmplItem( tmplItem, newTmplItems[pntNode]||wrappedItems[pntNode], null, true );
            tmplItem.key = ++itemKey;
            newTmplItems[itemKey] = tmplItem;
          }
          if ( cloneIndex ) {
            cloneTmplItem( key );
          }
        }
        el.removeAttribute( tmplItmAtt );
      } else if ( cloneIndex && (tmplItem = jQuery.data( el, "tmplItem" )) ) {
        // This was a rendered element, cloned during append or appendTo etc.
        // TmplItem stored in jQuery data has already been cloned in cloneCopyEvent. We must replace it with a fresh cloned tmplItem.
        cloneTmplItem( tmplItem.key );
        newTmplItems[tmplItem.key] = tmplItem;
        pntNode = jQuery.data( el.parentNode, "tmplItem" );
        pntNode = pntNode ? pntNode.key : 0;
      }
      if ( tmplItem ) {
        pntItem = tmplItem;
        // Find the template item of the parent element.
        // (Using !=, not !==, since pntItem.key is number, and pntNode may be a string)
        while ( pntItem && pntItem.key != pntNode ) {
          // Add this element as a top-level node for this rendered template item, as well as for any
          // ancestor items between this item and the item of its parent element
          pntItem.nodes.push( el );
          pntItem = pntItem.parent;
        }
        // Delete content built during rendering - reduce API surface area and memory use, and avoid exposing of stale data after rendering...
        delete tmplItem._ctnt;
        delete tmplItem._wrap;
        // Store template item as jQuery data on the element
        jQuery.data( el, "tmplItem", tmplItem );
      }
      function cloneTmplItem( key ) {
        key = key + keySuffix;
        tmplItem = newClonedItems[key] =
          (newClonedItems[key] || newTmplItem( tmplItem, newTmplItems[tmplItem.parent.key + keySuffix] || tmplItem.parent, null, true ));
      }
    }
  }

  //---- Helper functions for template item ----

  function tiCalls( content, tmpl, data, options ) {
    if ( !content ) {
      return stack.pop();
    }
    stack.push({ _: content, tmpl: tmpl, item:this, data: data, options: options });
  }

  function tiNest( tmpl, data, options ) {
    // nested template, using {{tmpl}} tag
    return jQuery.tmpl( jQuery.template( tmpl ), data, options, this );
  }

  function tiWrap( call, wrapped ) {
    // nested template, using {{wrap}} tag
    var options = call.options || {};
    options.wrapped = wrapped;
    // Apply the template, which may incorporate wrapped content,
    return jQuery.tmpl( jQuery.template( call.tmpl ), call.data, options, call.item );
  }

  function tiHtml( filter, textOnly ) {
    var wrapped = this._wrap;
    return jQuery.map(
      jQuery( jQuery.isArray( wrapped ) ? wrapped.join("") : wrapped ).filter( filter || "*" ),
      function(e) {
        return textOnly ?
          e.innerText || e.textContent :
          e.outerHTML || outerHtml(e);
      });
  }

  function tiUpdate() {
    var coll = this.nodes;
    jQuery.tmpl( null, null, null, this).insertBefore( coll[0] );
    jQuery( coll ).remove();
  }

  Sammy = Sammy || {};

  Sammy.Tmpl = function(app, method_alias) {

    // *Helper:* Uses jQuery-tmpl to parse a template and interpolate and work with the passed data
    //
    // ### Arguments
    //
    // * `template` A String template. '${ }' tags are evaluated as Javascript and replaced with the elements in data.
    // * `data` An Object containing the replacement values for the template.
    //   data is extended with the <tt>EventContext</tt> allowing you to call its methods within the template.
    // * `name` An optional String name to cache the template.
    //
    var template = function(template, data, name) {
      // use name for caching
      if (typeof name == 'undefined') name = template;

      // check the cache
      if (!jQuery.template[name]) jQuery.template(name, template);

      // we could also pass along jQuery-tmpl options as a last param?
      return jQuery.tmpl(name, jQuery.extend({}, this, data));
    };

    // set the default method name/extension
    if (!method_alias) method_alias = 'tmpl';
    // create the helper at the method alias
    app.helper(method_alias, template);

  };
})( jQuery );
